I would lose the shields on the marauder horsemen, since they lose their Fast Cavalry rule with your current setup. With those points saved, buy them a musician. And on the second unit of warriors I'd take away the extra hand weapons (they already have 2A) and give them shields for that little extra durability.

Of course it's a personal thing but I tend to go with the thought: "Nothing says 'elite' like a fully mounted Chaos army." My problem with a walking deathmachine like yours is that, against the wrong opponents, my fear is that it's going to be turned in an arrow cuision before it exchanged it's first hit.